Technical Info

General data

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WH THREAD

WH THREAD

WIDIN specific tabs can be selected to suit the working conditions by applying a step-by-step method of the unique WH method to satisfy a certain degree of female screw.

P≤0.6(40 over) {p≤ 0.6(T.P.I≥40)}
above tolerance : 0.010 + 0.015 x n
below tolerance : above tolerance -0.015
measure :mm

P≥0.7(36 below) {p≤ 0.7(T.P.I≤36)}
above tolerance : 0.020 x n
below tolerance: above tolerance -0.020
measure :mm

Case M3×0.5

Case M10×1.5

GH Thread

GH Thread

The non-groove tab (roll tab) requires strict bottom diameter management, unlike the cutting tab. Also the female screw is machined by plastic deformation, and the degree of strict tap thread is applied. WIDIN adopted stepwise thread of 12.7 μm (0.0005) tolerance.

Case M3×0.5

Case M10×1.5

Cutting Speed and Cutting emulsion

Cutting Speed and Cutting emulsion

The cutting speed depends on various conditions, such as tap material, type, acid water, bottom shape, workpiece, and cutting emulsion and sufficient care must be taken when applying.
The cutting emulsion also has three actions: lubrication, cooling, and semi-welding, which is called the three elements of cutting oil.
Since taping involves very complex cutting, supply sufficient workpiece emulsion for processing.

Cutting Speed and Cutting emulsion
Workpiece Cut Speed (m/min) Non-aqueous
Straight Tabs Spiral Tabs Point Tabs Carbide Tabs Roll Tabs HighSpeed
Synchro Tap		 Pipe
Thread Tap		 Emulsion Emulsion Semidry Dry
Low-carbon steel CO,25%
and below		 8~13 8~13 15~25 - 8~13 27~32 3~6 ◎ ○ △ △
Medium-carbon steel CO,25~
0.45%		 7~12 7~12 10~15 - 7~10 27~32 3~6 ◎ ○ △ △
High-alloy steel More than CO,4.5%
 6~9 6~9 8~13 - 5~8 22~27 2~5 ◎ ○ △ △
Stainless steel SCM 7~12 7~12 10~15 - 5~8 22~27 2~5 ◎ △ △ △
Tool steel 25~45
HRc		 3~5
(4~8)		 3~5
(4~8)		 4~6
(6~10)		 - - 15~20 2~5 ◎ △ - -
Stainless steel SUS 4~7 5~8 8~13 - 5~10 - 3~6 ◎ ○ - -
Stainless steel with precipitation hardening SUS630
SUS631		 3~5 3~5 4~6 - - - 2~5 ◎ - - -
Tool steel SKD 6~9 6~9 7~10 - - - 2~5 ◎ - - -
Cast iron SC 6~11 6~11 10~15 - - 17~22 2~5 ◎ ○ - -
Cast iron FC 10~15 - - 10~20 - - 2~5 ◎ ○ ○ ○
Ductile cast iron FCD 7~12 7~12 10~20 10~20 - - 4~8 ◎ ○ ○ -
Bronze Cu 6~9 6~11 7~12 10~20 7~12 27~32 2~5 ○ ○ - -
Brass and Brass castings Bs, Bsc 10~15 10~20 15~25 15~25 7~12 27~32 5~10 ○ ○ ○ ○
Bronze and Bronze castings PB, PBC 6~11 6~11 10~20 10~20 7~12 - 6~11 ○ ○ - -
Bronze and Bronze castings AL 10~20 10~20 15~25 - 10~20 100~300 5~10 ◎ ○ △ -
Aluminum alloy castings AC, ADC 10~15 10~15 15~20 10~20 10~25 80~300 10~15 ◎ ○ △ -
Magnesium alloy castings MC 7~12 7~12 10~15 10~20 - - 10~15 ◎ ○ ○ -
Zinc Gold Casting ZDC 1~12 7~12 10~15 10~20 7~12 27~100 10~15 ◎ ○ △ -
Thermosetting plastic Bakelite phenol epoxy 10~20 - - 15~25 - - 5~10 - ○ ○ ○
Thermoplastic Plastic Vinyl chloride nylon 10~20 10~15 10~20 10~20 - 27~32 5~10 - ○ ○ ○

◎: Optimum / ○:application / △: available / - : unavailable

Meter Screw Recommended Drill Diameter Sheet (Based on Grade 2 Screws)

Straight Tabs, Spiral Tabs

Size name
Thread Size		 Recommend Drill Dia
Drill Size(mm)		 Reference Drill Dia(mm)
Minimum(min) Maximum(max)
M3 X 0.5 2.50 2.459 2.599
M4 X 0.7 3.30 3.242 3.422
M5 X 0.8 4.20 4.134 4.334
M6 X 1.0 5.00 4.917 5.153
M8 X 1.25 6.80 6.647 6.912
M10 X 1.25 8.80 8.647 8.912
M10 X 1.5 8.50 8.376 8.676
M12 X 1.0 11.00 10.917 11.153
M12 X 1.25 10.80 10.647 10.912
M12 X 1.5 10.50 10.376 10.676
M12 X 1.75 10.30 10.106 10.441
M14 X 1.5 12.50 12.376 12.676
M14 X 2.0 12.00 11.835 12.21
M16 X 1.5 14.50 14.376 14.676
M16 X 2.0 14.00 13.835 14.21
M18 X 1.5 16.50 16.376 16.676
M18 X 2.5 15.50 15.294 15.744
M20 X 1.5 18.50 18.376 18.676
M20 X 2.5 17.50 17.294 17.744